21010120012191 has 16 divisors (see below), whose sum is σ = 28059665613408. Its totient is φ = 13983676262400.

The previous prime is 21010120012157. The next prime is 21010120012307. The reversal of 21010120012191 is 19121002101012.

It is not a de Polignac number, because 21010120012191 - 2¹⁵ = 21010119979423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010120012991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3386781 + ... + 7313721.

It is an arithmetic number, because the mean of its divisors is an integer number (1753729100838).

Almost surely, 2^{21010120012191} is an apocalyptic number.

21010120012191 is a deficient number, since it is larger than the sum of its proper divisors (7049545601217).

21010120012191 is a wasteful number, since it uses less digits than its factorization.

21010120012191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929882.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 21010120012191 in words is "twenty-one trillion, ten billion, one hundred twenty million, twelve thousand, one hundred ninety-one".